The correct answer is "They contribute to the rising action by describing the behaviors that take place between Roger, Madame Ratignolle, and Mrs. Pontellier".
In "The Awakening", by Kate Chopin, the veil of appearences slowly lifts up throughout the narration exposing the inner conflicts of motherhood, gender roles, femininity and oppresion towards women. The social and political context surrounding life in the South at the turnn of century, also plays a big role.
Addressing your question directly, it seems like you're mainly being asked to differentiate the storytelling stages of exposition, rising action, climax, resolution, etc. What is revealed in this excerpt (in the context of the tale as a whole), would best fit the category of "rising action". This particular stage occurs when the first clues of a potential conflict start to appear, setting things up for further scalation towards a climax and eventual resolution in the end.
Hope this helps!